Dewatering of calcium carbonate

a technology of calcium carbonate and calcium carbonate, which is applied in the direction of solvent extraction, separation process, chemistry apparatus and processes, etc., can solve the problem that none of the related art discloses the use of non-ionic surfactants

Inactive Publication Date: 2000-09-26
MINERALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

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Problems solved by technology

Although various methods of dewatering calcium carbonate slurries are known in the art and various chemical dewatering accelerators are also known, none of the related art discloses the use of non-ionic surfactants to dewater an aragonitic precipitated calcium carbonate coating pigment, when higher cake solids and small average particle size of the final product is important.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

An aqueous slurry of aragonitic PCC having a solids content of about 15 weight percent was treated with 0.2 weight percent, based on the weight of the calcium carbonate, TRITON X-100 by adding the surfactant while stirring the aqueous slurry. The percent solids of the filter cakes were measured and compared to an untreated PCC filter cake (No surfactant) the results are shown in Table 1.

example 2

An aqueous slurry of aragonitic PCC having a solids content of about 15 weight percent was treated with 0.2 weight percent, based on the weight of the calcium carbonate, TERGITOL MIN-FOAM 2X, by adding the surfactant while stirring the aqueous slurry. The percent solids of the filter cake were measured and compared to an untreated PCC filter cakes (no surfactant) the results are shown in Table

example 3

An aqueous slurry of aragonitic PCC having a solids content of about 15 weight percent was treated with 0.2 weight percent, based on the weight of the calcium carbonate, by adding the TERGITOL D-683 surfactant while stirring the aqueous slurry. The percent solids of the filter cake were measured and compared to an untreated PCC filter cakes (no surfactant). The results are shown in Table 3.

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Abstract

The present invention relates to dewatering of an aqueous slurry of calcium carbonate. More particularly, the present invention relates to the use of non-ionic surfactants in dewatering aqueous slurries of an aragonitic precipitated calcium carbonate. Calcium carbonate slurries dewatered using the non-ionic surfactants of the present invention have higher weight percent solids, decreased dispersant demand, and result in higher productivity.

Description

The present invention relates to dewatering of an aqueous slurry of calcium carbonate. More particularly, the present invention relates to the use of non-ionic surfactants in dewatering aqueous slurries of an aragonitic precipitated calcium carbonate.Calcium carbonate slurries dewatered using the non-ionic surfactants of the present invention have higher weight percent solids, decreased dispersant demand, and result in higher productivity.BACKGROUND OF INVENTIONIn the production of high gloss paper, a base sheet is coated with white pigment. White pigments include talc, clay, ground calcium carbonate (GCC) and precipitated calcium carbonate (PCC).PCC has a key advantage over GCC in that smaller average particle sizes with moderate specific surface areas (SSA) are possible, whereas ultra ground CGG has (I) high energy costs for grinding and (ii) higher SSA in the final product due to solid particle morphology. Fine PCC, that is PCC with average particle size of below about 1.6 micron...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C01F11/18C01F11/00D21H19/38
CPCC01F11/185C01P2004/61
Inventor HANSEN, COLIN WAYNEWENER, I, CHRISTOPHER ALAN
Owner MINERALS TECH
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